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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd4e135dea8ac818e99d47895885c4124af5796afa2d41863806ea9e0218f24' 
  AND token = 'CQN4kpxIsH4scFOUbC96YII/6qFkivwqSugJ+afJASY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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