SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5ac6768a320b89d744913f3b0b136e7d9c25284151c17e32ac6dab2537fb0b' 
  AND token = 'zDY+KTpEXo7wKm14bVyhZN6oHCEKjeP2ghvs4tzwFiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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