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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d07046c3bb006ab3010ab4e2d75b6d15c77f408e739609f87c76b6f8e4fb69' 
  AND token = '8P1MY01Lvv0J17EKQmeFnvobhlUEh9j6Q8F9TOfzz0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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