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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1fdcc2c168fcd55ed1137b0529b7b4f3be6c705f35417ee0a03e624be6d299' 
  AND token = 'd5SeXC9ZrkwixGj4M6QAGLEFZR8mURuljF2IsxNYgA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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