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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03df3c4c7b19f13e459c9072e797f69c811a2b74b1f225aaf76d869b233a09ac' 
  AND token = '38udgypgLretJFsGmLOAtaclaPTCm35US0klczCboBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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