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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd797299e21d54a7785a4bac87bcd7eb9866212a53a346692228151c4b3fba730' 
  AND token = 'bXOmniBKTBkf8Rq7PemYItgQB8ZFTwV77u0r79/Eif0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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