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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5148040e9db5062afe02ad5aacac491b22268141dff261d33fa90c8c8843efeb' 
  AND token = 'QlNXc5BRrZ89uZhtS++3L86cY9hU37Y4ep0qAvarL6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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