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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bbe96c1cbf56735848ff1267783277f3456c9230844a111362d8b8ab58366f' 
  AND token = 't4am20hicdmZF8HiJiU8GmlOeQGGhqxrgGcg/CAr5Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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