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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1d35f4ed073f6dea88d30c651cd2a25e0c925b202cfa2e5f75c433f10d785c' 
  AND token = 'Bzmw3tJHdxiAY7/mwtBssX5Ws1XANJJIWMmrRW1BWQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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