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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb4831feb831b7273fa1e8e4f01bc01fcaccabf16e28c4dafe0380f4d83f632' 
  AND token = 'BFJOcbAFh8l8SKrI6JT1+SgOyiAlkWBottdKXwCtSRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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