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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba60479e9714d64657bdaaffa4b32b309e0ac53748c3ae4b070a3468df7cda89' 
  AND token = 'KwrUG1X5qY/NiUWqC5G5YTjZb0sMQF86igUcHySgj8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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