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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0f0ca817a3b65e4f00e348aaec16d67bc65520d4b9ae45fda67c8472c9bcae' 
  AND token = '1ne9PGWE3Yxruaac+Xzhf2pqNNmtOOWNZxN8dHhvpiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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