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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13658c6990641cf8047678702d1e510cf32b39b52178d3f12cbc3e32266ad3f8' 
  AND token = 'E9kOpi2WFlkSvCknkoW87wJzdE9aVCDHYRwZayJhamw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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