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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c8b519ff5b118d915c730e39e5d2825dadd00d02cc39cbae02e96672eac754' 
  AND token = 'nvdjuWDKLVFydQtQ/WhRUy1K9k+6Jvf2WlaAvYHfl/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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