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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f569001c98ce9738e4955a090a1bd504871a876eab79b87a38d36af4e8e96f7f' 
  AND token = 'ATPHcHbYs/EqWyMC27CEjDRAagU+yjs1zqKCze7BhmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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