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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa90044bbb4f9a3b4d40ddf59da58fb8b8a55b17606bb7eec14fb863c9d10b4' 
  AND token = 'MZvXqmnMHXe68UdZ0aSqZ5JDqY0SSo0FD+nvgnFEjO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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