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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79834bf41fe58f18c383c4f1f8b868edfc151b169981d7a3ab9be87a5b320fd' 
  AND token = 'z+q6bE9oZVdOZy1aGZtFhRt5DMp1TSz/JDZhAfaLnR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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