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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70c8c1e6bee2eba1f45ccc6232d170e3c357247addf6f29e4eaea0a60f34b19' 
  AND token = 'g0tF7fmAvhIDKETL9A2OfipDLPW1S8fGxL+uSZe7g2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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