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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e46d2d6c9d0353ac49bc3eb165c8bd160893a025ee2fd5ca83ada1e5adf28ba' 
  AND token = 'kHGSqWzOm/aQohaQ80u/R6N0sYYsUJlJv5bfHagsBoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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