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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498484252a0e66e7f3eea6d680678f6393c0e1d893f2580dda55e1b4c02abef0' 
  AND token = 'd0+s5rOT93ZPAyNDSq7JUyKn5Oh3505rdlsWWXAxa/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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