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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3087c33d10980f9ada26b6c1fe3802b40152a3a32ab1fbc8481ba00f918aa9' 
  AND token = 'UhMQz1bob9KgJqIUJjMG9wZLjSKj1cT2tej6VjgAR9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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