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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50d70d5960a7e8e829ed09e766a18b32fb0d91b56dc8b7fff066d3b12b49335' 
  AND token = '0hQuxQuA1il3DreK/ZZPgM/hlqO+SWC6RyBme9E3Z3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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