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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35f0138591ca8684c3b5fb0c97066bc1a6ee6389f50f904257ae0da13ea086b' 
  AND token = '1JLXn+BPHAoaGHgxG78ar4JUWyLVvGEb4a5x9/F0qNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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