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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8c477731b7628e42c08742b587efd8b4a39550c3282524611ae40311e81437' 
  AND token = '4xlwGFx/6T8/HpoizG3NbWXqtw3530XYEDEE8MsRnd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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