SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13597d81bf2fcbce55beec61aff41f1e6366bf7c28b0c23f8770f989fccfa3f5' 
  AND token = 'XGngQuDeKEgWzjqz8MuFOvmhShWOprijNps+viHYBeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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