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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9253af101c5727d087cb608e05db98a67af0269ccbc16d550f6db3291a8f91a' 
  AND token = 'Dz0MX5i4pCiBUi5EKAszV2wXDpD5DuOXF6BgJvfx2FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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