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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702da59a49224d60bd305970416908f44de718deb9e29848e9f38a9f3036c5b9' 
  AND token = 'xCp7wagHxTU5dpqIcCkzFW00L8zGGVo+K3W31u/aWSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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