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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c3245066245b715c646d891bc715ef18fdce125db2c5dfbc77c6cbae414f7c' 
  AND token = 'qaHbwmaK7L+Pv4rnf+GKRoiKmdGOc84maPVbMfpke4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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