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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a775cc06ed07351d942a686b8402c60129d3feb69cd2b0b675b7afa13cbf4cd7' 
  AND token = 's6nCccsUizCiPAggB8XPH6g5OXyrlkzoJUWVOfV02kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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