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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57716e582954353dc145f3f5fefd76b2a7dfc63b23269121182e84cac75513f9' 
  AND token = 'dVctqkjelBAd/o8LUISp7+oWnIbszB8CtSovURvgxyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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