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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e6b9e74ebb4e2a7610897871a789f42688fb493de4be35daf5747d5f885217' 
  AND token = 'VBkYsdom/hZ2QnwLOlMYYGn5QCsjc2Ze233PYQ3U7os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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