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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b538fe1ce343025bf1776aee82b52bfba1824518099929e502b863e1d865e515' 
  AND token = 'ePZNr1WPRUiy5fsCsAn3mIVdA0HAMEeqVpmZN4ip5ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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