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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc98b3b06e1fd6a4989728261bb7b7cc896638ecc4e524333f68a7c8b0bd0077' 
  AND token = 'N6BwS/reecsRldMij36e+L1PpxJtUL+Jn1RzCTnQchM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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