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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b0d364dd34479ff3c5c5bfe23de34c1abd8e5ebd58304f4f1713056de231ec' 
  AND token = 'tJOSY/JHa9QHbzI51GyIYdU16VCL8lYU2x8BdWpOQr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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