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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534add323c7b2827a3d66f35b708116ac2b2ea37a87698a9184a35c93dab859c' 
  AND token = 'Bf0ydEUY2/HmfCnfKRnlMAJ4q7h5viWdlK6io7ILjic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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