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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284998e70c3acf476726e6f9ef9fb7eddeb0f58da8a73aac4815f0be8603271d' 
  AND token = 'JHgcR+p/qVsLKqY8EQEtFd5A6n34tGHsYS1St8kObD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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