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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68378d96766fd4b7798f7c9a7725f7cf6cd0bb81e9a09d6825b9f8e2db0c698' 
  AND token = 'CiL3TZuzwgBzMr0JMQcM+rL/YyjTM5ODKaDBq92cs8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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