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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2892558a71a10973199987cb206e7c419d3860e4b6864a0acd17a4d0abdc6fcc' 
  AND token = 'jZOy7TTQBrtW302E9HM8ixFD98WZPucv5gWUk8AV9e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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