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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7902ef0f71bbeef0063628caeb09d9c1824ac0f16f84b11fa04711500940747' 
  AND token = 'QZPKcFRiLKU5ma3YT+jRNp1vDmiAEfqtphcOOEN5DUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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