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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872a10ae2a289de5819f8b3797ddf8f6ad375bef9db62e60e3488713677a780c' 
  AND token = 'phzaG3S+z777ItlgzG2qY04l2LUA6hSoQUqHJPxo3LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}