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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfdded5454489e993eb5804ef39fe7ffbe53474fd7279c2d5e2b1f0b1ed0bd40' 
  AND token = '1bA/2V8GnqO0wVHA94PLVCazk5IE4MqjUiNxDhlB960=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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