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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0541bb9267c3397d9bb96d395a2b92cc4054c24772938ae3d6f7fc95532deb' 
  AND token = 'noV6877R9LwkAI7Abj4M17gUhL+4uuRy7w/QdCvkx5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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