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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825624dcf85b7a8c14f84f78e8b1e3146b93589cfbd345c122a181d8a90362bf' 
  AND token = 'CXcSmMGL46n39PBiauh96XxHIMyhsV2sDCBUbrc6sXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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