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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcc15592c2a5bf51aba42137b1923698aeb1ecdd5475a91abbb8f12d8ea5883' 
  AND token = 'VKGoJ6c7BxhgOI7rhxLJc4IkU5MN3iMc3Vdyi1ybRr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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