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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efe21b355f2f1893445e58567415a3d71c8140db5257538423926b7dce3bf3b' 
  AND token = '/d62J/HQMSD7EEnDo/TjAfA84I0hi3FLlhvde6wMWjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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