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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3981ed6d71aed2bae728e59fdba49584473ed988291f90b6aaba081eeb0870' 
  AND token = 'Gz4HruT8oHwxHYKY34/KmL63mAI+N/gfLHx7La9nkkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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