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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8892449c6ddebfa77251e71c54fd621b02f9cb3b7d72094a6abc85723aeb9ced' 
  AND token = '5j8eD1QoBPKrv5MLdGicNegoCAOiQBdjD3GYb/unYiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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