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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc43b88f74c518bce885c738a7503e35144188ce7ce0fb722f8a76d5ed832fd' 
  AND token = 'Gswoa3oH8O7J4Ke72YgTY0P4ZsvNDp6GKeNZx7zmNUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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