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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a3ca4b16576f429c364e3d6ac610ee14e5f659a808f7fd2a9706d7a1131d0a' 
  AND token = 'q7Kd+r0O4ah5DmY+rKqSKqgm8eP1kR+lqb2TdLOxe9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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