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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b875726b7d093d5c0cfd008bdce4255ece80de4746dbadcd22256dc9b1d5eee7' 
  AND token = 'tWvk1uZEh2MdJ9R9j3xFgVAApJEsagE9GZr+HHQL65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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