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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af805e41de178b89d324f433d7e4347e9c5616ec81ff3b32d9b7215b842f056' 
  AND token = 'ABtVHq8rnl565VZ4mQEyfFVpe/xQc1JCVJWEJf8Zv9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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