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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336eb0de69cf6c411270f2d99de245a323bd42e6c330c8ecf769eb364fba9011' 
  AND token = 'YLjqSeRBrhyq/4l3/Ph+Bboh94hJi+MFbaiutMi4Rs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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