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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9ba9cd24c60d974a853569bd2c09896bf9a3a9e7b56916a2055f4d72039e18' 
  AND token = 'UwDJxp4YJ4UszqDVmXdN2xDznJ+5hyBT+xV4oq5z6Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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