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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7b305acca34b28ef5e9b43ac7705c098fd3e6a3b5ac6008066459060429906' 
  AND token = 'WIFJwiVAhxCrNW6g1hFYzHE6EQvTXDO0eXZZjPiBXdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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