SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73e56888eedc44e972b7fce554271d2c08a5a7b40a0c2e6a834dfefb6954fc8' 
  AND token = 'rKpvrHD6+WrpIeM0VS0QIqgEIjCCLRXhhwSLyF2jBW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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