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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900bc6aa3b5a2f66ff6a18f717fac807f3caf1ff4e7ee7af6ee98a90e6c65722' 
  AND token = '1hcUzPiBeAqnSbKAzPSlC9uA0rj12oompA1F1XaLNjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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