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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0040ae06a91d37a408b842f5bfb35583aa4b1df393cc1abc9fb48198e796217d' 
  AND token = 'aEjFlwxj84BBuYS746Bs+aZbV1nAt4CAVEFaso3rJ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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