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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5353352d0bedeb32714d8bc0755f8035b60b756eb32bd1df7611e5082369824' 
  AND token = 'vGTyLYoKRkxlmNjSorehRT43NBWkXIocEfGEBYlNwY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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