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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acd44fd1b22ec68ec8a16d97f1cf85cb53f473b6d8c930f87dc26e4458ffa88' 
  AND token = 'KJgRazqrrSxvHqBBs/9lnni0RYSN8ec9M/8I48joOfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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