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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca8776ca73a9dbb67ea4330e814de40e216c51b772ce80e72ccd159d27da40d' 
  AND token = 'S/wjWIu6Ug4e+9QS5qcar7SaTaxGzZO3mwDjawwyxL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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