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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae668a88ff0964a7e8a92f200b837b5cd80e102dce8f678695f7b633eded43e' 
  AND token = '7AA5tfZJM7GPaNknMDtLjpUJfxhRTBIc/p+uH7PUtg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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