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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556272828d3efc8b44d833d193083671771c5a6b6ea3e39b9340c626d84f6769' 
  AND token = 'P/HdFK71P4TGxCJODLhutfHaDqcmTk4p7aEk1CeOii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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