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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd074008d009f1ab76a11b49a5dc4dfd454e9d141d8928b6c7cb538f2990dae2c' 
  AND token = 'Nd13mQrf2kDPf1mjyg2WC1l4bwPKLOPVa2TXwGgsYZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}