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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b237d3df9b4b92b332c9f0196cdaf3ff9e24c9313d97b157ccf3895188624c' 
  AND token = 'bUuYTtrEVcVl5cB1gEVZMPx68gT9TAUQgnjHsExn6Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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