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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6d1d9af12b144e40e11d15b3524088cf1fb0072c771c34a55221da329176fb' 
  AND token = '1XqmJhfAP/v8f0pdredjRk1/8KeO30WzfWhE4IrfGR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00181

JSON explain

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