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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d05758fb6ee06191c3b97f9a7de1ec1fa2f332bae236c0672d3e88c19777d9' 
  AND token = 'Tg2vcIBYA6PmQ3Z+zusBeBzWcvRKFcLtMeT5WSCG7xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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