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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f784e7c9e4f4ff64853039d61ee56fd4dc8db33c0f19c3a673ebaeb38ae7fc' 
  AND token = 'ywzG5NIQYzCmOmgF63JpSDMVVHp1vpAdOb+57ILEI00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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