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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3eed8a321420740ec308fcac3feaa9bda5040d83c0b5a43671ea8ad192f24e' 
  AND token = '2oxJZCa3oZ0yhQ0T7PYVnUHI5fx04JUAIB44t4ytRyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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