Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02bd3ebcab94db280c303c2e6ddac908e4bc2e52ad0914ab7f689a5485a2203' 
  AND token = 'avRD2TNDQe6JMpNDfKDEYs1wA+i++lATcCTuRy81uzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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