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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57363469311e8bff18d801aa1fef9b5c57cfa4ac3d7a9a163546cb13f1f4a328' 
  AND token = '2OyqzoqULbztMXmPMmvx28hOo9lt5qHh68rXk2au7bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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