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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bcd035bddbab87a11af0442bea10db7117ab72c0bea6d11eda1758ac1af119' 
  AND token = 'ngczOr/X3BxWTV38lxbkibvaJzNULrP/oKB+vIzwmqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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