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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a28dcec7dfd30fc0508ae462c7003976820203e0b61547b145009cdc1c2d7f2' 
  AND token = 'smikk+6xdy1pfTJahnAKT5uLBC4G66QPQDzzB/5kPG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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