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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf17879b07c031e9fa045fd3faae2cd33b7ca2c2820c693ed2c13fbf98af3d6' 
  AND token = '1Yi9ZW6WgMKpxeqns/ag/UOEcgwOWPKN1Zqz/GcG1Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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