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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddeae8b4bba821166ad733f66103af86673ee887fded4ec3e12193266442fbc' 
  AND token = 'X2QPZCBDx6/X2/MEKgVJBCk1y2miWXn0TrIvkte6No4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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