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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcf8dd31d02f11270aae76e172a7455a9282324d91e87d23152157a53ad114d' 
  AND token = 'KOFGzWMsuAuP162wHcpkCjIqCIXPr6jPslCU66d+ZiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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