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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f5b5600d77154b3fbd16ab3d42c8ff610b860cbefece3b780b8bc4ba0a8985' 
  AND token = 'snrcwbDj05CUWv2QWnoF8ynCUd2HJW4WZTe8f2JUd/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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