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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2042592525ffd6eb097295686de46cb5fb3f34df45ca70a3247a0c9a4721c6' 
  AND token = 'p0nJLi7ZUUXIx26yLfidL7e2dnBWHkEmj8AQj6mNMNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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