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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1f00e09784c4590d066f7a9e672f85d5a89174ffa74d16f89362467333b519' 
  AND token = 'YR2p/EOPUbJM+n8EZmlYiIdQupn22J1NJHR+TKS9L7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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