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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6a9b600999d41968fec4981c69a467ae31f3b5708ee816d23ffe55cad4f09c' 
  AND token = 'LnbezJEwXm/78pfTGmfFJfz7RCPawCTgYsJsZEhYtyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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