SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06cd2138db3d7f06f0607faf965582f288204c670ec8d485faa65193ce53e30' 
  AND token = 'VMxqFHPtlOw64Hwrl5YaWG7YCyqbkMPbnmzFKMu/VbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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