SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ac710ab2316d43daff1ab599635b3004bf6ce8237ece654c844130b7f200ec' 
  AND token = 'lIRLVKUsiu+uWcpJ9Y+cYURo4bQc4/GnRF89gXr4BHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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