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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04e76426fa0bcdb941c9e8bded642bbad9085f916fa258b57aba4a39e6dce70' 
  AND token = 'jJlckNme6HOWpfqsoW1AVQhWcNl2HbZ87x9gxPiQ7q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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