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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914eb634dc8b3c7b2beaa8b32e9a93f245dcbaa25b6b829d3109f703db3d5b3e' 
  AND token = 'S0O0vnFa7+/v63Ei4TDrwVqCZI7yyguDqKV6d/c1490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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