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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827ff347723f57612ac9ef2812ffbe9c490bfe7b197fba7966a157f6a5753991' 
  AND token = 'ZwUFGmQ18sbs0qJALyZots4mM/9x9I29QcpdZ7ViRAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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