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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7053d8d4b27f4329b2e0d11c3a18839025ad662a0ef38bc7187ad28d6752a2ae' 
  AND token = 'PVDJ5Icdbv8oJxk7z6U8pwV3iLARUMem6kUbVnqiPG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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