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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803260d1205e86f71796ca7c7ee859db5ad62736d9d1f6ae6ccf34b910b021ab' 
  AND token = 'HdGwj3dDbeS56KELnfVMrZT+zz7y83QtbkgjjsEhhQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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