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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696380d3b5977a88b7f6e42cacff0fe6cca620cec81491767636f6282caffd65' 
  AND token = 'PdMGN//Tk/cx4/gHeTj2trKz9cZfSfyRTIXUVlhe4Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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