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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08682116e30ad19cc9b93fea08f932b43de36153cc7f3fd199ff5a1d9eaaeac' 
  AND token = '6rKbVRNO5KbS0ueYe5e6O1dDHZ+HAdiqvH7dDUw9VEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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