SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913b26175241170a815764f1910fd542220a384df2e0b1113346f6c3bafa3984' 
  AND token = 'XFYxkjKrtegqBKZIjjS6QHjHzMgjjuuj/N5dLohXpzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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