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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700b7ddc5b68fec74c4c84da592a2cb9511073c166b4456741bc1ea40ef883b2' 
  AND token = 'KhmNbRfFpUmH+1tv7gFIs5+Ek4+rMNw0ak0PKsRuK28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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